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 Apr 28 revised Finding Laplace Transform of $te^{-t}$ added limits at which some parts are evaluated Apr 27 comment Finding Laplace Transform of $te^{-t}$ True, then I've made a mistake somewhere because the answer should not be 0 Apr 27 asked Finding Laplace Transform of $te^{-t}$ Apr 13 accepted Arc length of astroid Mar 2 comment How to solve $xy'+y+x=0$ @Did well, I didn't read that obviously Feb 24 accepted How to solve $xy'+y+x=0$ Feb 24 comment How to solve $xy'+y+x=0$ but then you are just multiplying what you divided by Feb 24 comment How to solve $xy'+y+x=0$ but then the integrating factor would just be "x" though? Feb 24 asked How to solve $xy'+y+x=0$ Feb 24 accepted How to solve $xy' + y + y^2 = 0$ Feb 24 asked How to solve $xy' + y + y^2 = 0$ Dec 13 awarded Popular Question Sep 6 comment Can you prove $F=ma$ mathematically? So $F=ma$ is derived directly from an axiom Apr 29 accepted Radius of convergence for series Apr 29 asked Radius of convergence for series Apr 28 comment exercises for Euclid's Elements You can find some on archive.org. Just search "euclid exercises," or something related. Here's one example: archive.org/details/euclidbookwithn00euclgoog. Also you can just look for copies of the elements and sometimes they put exercises at the end of each book for schools back in the day. hope that helps, I'm looking for some good exercises as well Apr 13 awarded Critic Apr 13 awarded Popular Question Mar 17 comment Arc length of astroid $x^{-2/3} + 1$ though, right? Mar 17 asked Arc length of astroid